Sputnik V second dose hits production roadblock

Russia's Sputnik V seems to have hit a roadblock in the production of the second dose of the vaccine. According to the sources, the Russian vaccine maker is facing manufacturing issues with producing the second component (AD5) of the adenovirus vector-based vaccine.

Government sources said a team of Russian scientists visited India for over a month to try and iron out the technical problems being faced by domestic manufacturers in producing AD5. Sources said the second component of the vaccine is harder to manufacture because of its design as an adenovirus vector-based vaccine.